Table 3.

Intercorrelation of all study variables.

Variable		1		2		3		4		5		6		7		8		9		10		11		12		13		14		15		16		17		18
1	Sense of humor (t0)	1
2	Sense of humor (t1)	0.74	**	1
3	Enjoyment of humor (t0)	0.47	**	0.30	**	1
4	Enjoyment of humor (t1)	0.42	**	0.54	**	0.66	**	1
5	Laughter (t0)	0.74	**	0.61	**	0.33	**	0.39	**	1
6	Laughter (t1)	0.57	**	0.82	**	0.19		0.43	**	0.77	**	1
7	Verbal humor (t0)	0.83	**	0.64	**	0.25	*	0.23	*	0.51	**	0.41	**	1
8	Verbal humor (t1)	0.64	**	0.84	**	0.20		0.32	**	0.46	**	0.63	**	0.72	**	1
9	Finding humor in everyday life (t0)	0.90	**	0.65	**	0.19		0.22		0.57	**	0.45	**	0.80	**	0.57	**	1
10	Finding humor in everyday life (t1)	0.72	**	0.89	**	0.16		0.30	**	0.57	**	0.66	**	0.67	**	0.74	**	0.74	**	1
11	Laughing at yourself (t0)	0.79	**	0.65	**	0.11		0.24	*	0.55	**	0.51	**	0.63	**	0.54	**	0.77	**	0.65	**	1
12	Laughing at yourself (t1)	0.58	**	0.82	**	0.10		0.29	**	0.35	**	0.60	**	0.53	**	0.62	**	0.57	**	0.76	**	0.72	**	1
13	Humor under stress (t0)	0.80	**	0.51	**	0.28	**	0.23	*	0.44	**	0.32	**	0.57	**	0.41	**	0.76	**	0.50	**	0.54	**	0.33	**	1
14	Humor under stress (t1)	0.56	**	0.81	**	0.16		0.28	**	0.37	**	0.55	**	0.43	**	0.62	**	0.54	**	0.75	**	0.43	**	0.61	**	0.60	**	1
15	Perceived stress (t1)	−0.12		−0.22	*	0.02		−0.02		−0.12		−0.23	*	−0.07		−0.09		−0.13		−0.18		−0.19		−0.33	**	−0.08		−0.21	*	1
16	Work enjoyment during practical training (t1)	0.21		0.38	**	0.13		0.19		0.28	*	0.36	**	0.05		0.26	*	0.16		0.33	**	0.10		0.31	**	0.24	*	0.37	**	−0.56	**	1
17	Flow frequency (t1)	0.18		0.42	**	−0.01		0.08		0.22		0.35	**	0.11		0.27	**	0.19		0.39	**	0.08		0.37	**	0.23		0.50	**	−0.26	*	0.54	**	1
18	Perceived meaningfulness of work (t1)	0.36	*	0.41	**	0.08		0.03		0.27	*	0.28	**	0.27	*	0.31	**	0.35	**	0.46	**	0.36	**	0.40	**	0.30	**	0.45	**	−0.37	**	0.58	**	0.48	**	1

^**p < 0.001;

^*p < 0.050; Measuring points: t₀ = Baseline; t₁ = 6 months after the humor intervention.